GB/T 40388-2021 specifies the test method for determining the room-temperature shear strength of carbon/carbon composites, applicable for measuring the shear strength of such materials using the punch shear method. The standard defines the test principle, sample preparation, operational procedures, data calculation, and reporting requirements. The core equipment includes a testing machine that meets specified requirements, a dedicated shear fixture, a vernier caliper with an accuracy of 0.02 mm, a micrometer with an accuracy of 0.01 mm, and a torque wrench with a specific range. By applying a constant-rate compressive load to a ring-shaped specimen, shear stress is induced in the thickness direction until failure occurs. The maximum load is recorded, and the shear strength is calculated, providing a standardized basis for material quality evaluation and application.
| Status | Active | ||
|---|---|---|---|
| CCS | Q23 | ICS | 83.120 |
| Release Date | 2021-08-20 00:00:00 | Implementation Date | 2022-03-01 00:00:00 |
